简单封装sqlite数据库操作类 BaseDB 用于完成对sqlite的增删改查，使用前先导入libsqlite3.0.dylib库

//
//  BaseDB.h
//  SqliteDemo
//
//  Created by 赵超 on 14-8-26.
//  Copyright (c) 2014年 赵超. All rights reserved.
//#import <Foundation/Foundation.h>
#import "sqlite3.h"@interface BaseDB : NSObject/***  创建一个表*  sql:执行的SQL语句*  dataName:数据库名称*/-(void) createTable:(NSString*)sql dataBaseName:(NSString*) dataName;
/***  执行SQL语句，主要完成增加、修改、删除*  sql:执行的SQL语句*  params:SQL语句中的参数*  dataName:数据库名称*/
-(BOOL) execSql:(NSString*)sql parmas:(NSArray*) params dataBaseName:(NSString*)dataName;
/***  选择数据*  sql:查询的SQL语句*  params:查询SQL语句中的参数*  dataName:查询数据库名称*/-(NSMutableArray*) selectSql:(NSString*)sql parmas:(NSArray*) params dataBaseName:(NSString*)dataName;@end

创建的数据库文件位于 /Users/zhaochao/Library/Application Support/iPhone Simulator/7.1/Applications/07D17328-B63C-4D87-9B6C-03AA5CD681EA/Documents/zhaochao.sqlite，

就是 NSString *fileName=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/%@",name]; 这个目录。文件可以直接用SQLiteManager软件打开，也可以在firefox浏览器中安装sqlitemanager插件打开，如下图

3.BaseDB.m

//
//  BaseDB.m
//  SqliteDemo
//
//  Created by 赵超 on 14-8-26.
//  Copyright (c) 2014年 赵超. All rights reserved.
//#import "BaseDB.h"
@implementation BaseDB/**  获取沙盒目录*  name:追加的目录aa**/
-(NSString*) DataBaseName:(NSString *) name {NSString *fileName=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/%@",name];return fileName;
}
/***  选择数据*  sql:查询的SQL语句*  params:查询SQL语句中的参数*  dataName:查询数据库名称*/-(NSMutableArray*) selectSql:(NSString *)sql parmas:(NSArray *)params dataBaseName:(NSString *)dataName{sqlite3 *sqlite=nil;sqlite3_stmt *stmt=nil;//打开数据库NSString *fileName=[self DataBaseName:dataName];int result= sqlite3_open([fileName UTF8String], &sqlite);if (result!=SQLITE_OK) {NSLog(@"打开失败");return nil;}const char* sqlCh=[sql UTF8String];//编译SQL语句sqlite3_prepare_v2(sqlite, sqlCh, -1, &stmt, NULL);//绑定参数for (int i=0; i<params.count; i++) {NSString *param=[params objectAtIndex:i];sqlite3_bind_text(stmt, i+1, [param UTF8String], -1, NULL);}//执行查询语句result=sqlite3_step(stmt);NSMutableArray *resultData=[NSMutableArray array];//遍历结果while (result==SQLITE_ROW) {NSMutableDictionary *resultRow=[NSMutableDictionary dictionary];//获取字段个数int col_count = sqlite3_column_count(stmt);for (int i=0; i<col_count; i++) {//获取字段名称const char*columName=sqlite3_column_name(stmt,i);//获取字段值char* columValue=(char*) sqlite3_column_text(stmt, i);NSString  *columkeyStr=[NSString stringWithCString:columName encoding:NSUTF8StringEncoding];NSString *columValueStr=[NSString stringWithCString:columValue encoding:NSUTF8StringEncoding];[resultRow setObject:columValueStr forKey:columkeyStr];}[resultData addObject:resultRow];result=sqlite3_step(stmt);}//关闭数据库句柄sqlite3_finalize(stmt);//关闭数据库sqlite3_close(sqlite);NSLog(@"查询完！");return  resultData;
}
/***  执行SQL语句，主要完成增加、修改、删除*  sql:执行的SQL语句*  params:SQL语句中的参数*  dataName:数据库名称*/-(BOOL) execSql:(NSString *)sql parmas:(NSArray *)params dataBaseName:(NSString *)dataName{sqlite3 *sqlite=nil;sqlite3_stmt *stmt=nil;//打开数据库NSString *fileName=[self DataBaseName:dataName];int result= sqlite3_open([fileName UTF8String], &sqlite);if (result!=SQLITE_OK) {NSLog(@"打开失败");return NO;}const char* sqlCh=[sql UTF8String];//编译SQL语句sqlite3_prepare_v2(sqlite, sqlCh, -1, &stmt, NULL);//绑定参数for (int i=0; i<params.count; i++) {NSString *parm=[params objectAtIndex:i];sqlite3_bind_text(stmt, i+1, [parm UTF8String], -1, NULL);}//执行SQLresult=sqlite3_step(stmt);if (result==SQLITE_ERROR || result==SQLITE_MISUSE) {NSLog(@"执行SQL语句失败");sqlite3_close(sqlite);return  NO;}//关闭数据库句柄sqlite3_finalize(stmt);//关闭数据库sqlite3_close(sqlite);NSLog(@"执行成功！");return YES;
}/***  创建一个表*  sql:执行的SQL语句*  dataName:数据库名称*/
-(void)createTable:(NSString *)sql dataBaseName:(NSString *)dataName{sqlite3 *sqlite=nil;NSString *fileName=[self DataBaseName:dataName];//打开数据库int result= sqlite3_open([fileName UTF8String], &sqlite);if (result!=SQLITE_OK) {NSLog(@"打开失败");}else{const char* sqlCh=[sql UTF8String];char* error;//执行SQLint result=sqlite3_exec(sqlite, sqlCh, NULL, NULL, &error);if (result!=SQLITE_OK) {NSLog(@"创建失败");NSLog(@"%s",error);sqlite3_close(sqlite);return ;}//关闭数据库sqlite3_close(sqlite);NSLog(@"创建成功");}}@end

4.调用格式

    BaseDB *db=[[BaseDB alloc] init];//创建表NSString *dbCreate=@"create table zhaochao( username text primary key,userPasswd test)";NSString *dbName=@"zhaochao.sqlite";// [db createTable:dbCreate dataBaseName:dbName];//添加数据NSString *insertTable=@"insert into zhaochao (username,userPasswd) values (?,?)";NSArray  *insertParmas=@[@"acasdfaa",@"bb"];// [db execSql:insertTable parmas:insertParmas dataBaseName:@"zhaochao.sqlite"];//修改数据NSString *updateTable=@"update zhaochao set username=? where username=?";NSArray  *updateParams=@[@"admin",@"zhaochao"];// [db execSql:updateTable parmas:updateParams dataBaseName:@"zhaochao.sqlite"];//删除数据NSString *deleteTable=@"delete from zhaochao where username=?";NSArray   *deleteParams=@[@"aa"];// [db execSql:deleteTable parmas:deleteParams dataBaseName:@"zhaochao.sqlite"];//查询数据NSString *selectTable=@"select username,userPasswd from zhaochao where userPasswd=?";NSString *selectParam=@[@"bb"];NSArray *result=[db selectSql:selectTable parmas:selectParam dataBaseName:@"zhaochao.sqlite"];for (int i=0; i<result.count; i++) {NSMutableDictionary *arr=[result objectAtIndex:i];NSLog(@"%@",arr);}